To Sleep Perchance to Dream : an exhibition of 17th century sleep-related paraphernalia at the Folger Shakespeare Library offers insight into attitudes towards sleep and dreams. Insomnia? Try eating some lettuce.
The Sleep Medicine Home Page: A comprehensive links and resources one-pager for both professionals and sufferers, resources regarding all aspects of sleep including, the physiology of sleep, clinical sleep medicine, sleep research, federal and state information, patient information, and business-related groups.
Dreams: Night School Revonsuo puts it, "The primary function of negative dreams is rehearsal for similar real events, so that threat recognition and avoidance happens faster and more automatically in comparable real situations."
Mapping Memory. "Turn the human brain upside down and all around to see how memories are saved (or lost)." National Geographic has a great interactive 3D map of the brain as part of an excellent feature on memory. [more inside]